AUGUST 4, 2026
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Case File

CVE-2023-6858

HIGH · CVSS 8.8 EPSS 1.53%

Source: NVD + CISA KEV + EPSS (historical backfill) · Published 2023-12-19 · Last synced 2026-08-04

CyberRota Analysis

This is a high severity vulnerability with a CVSS score of 8.8. It affects Firefox.

CVE
CVE-2023-6858
Severity
HIGH
CVSS
8.8
EPSS
1.53%
Firefox

Original NVD Description

Firefox was susceptible to a heap buffer overflow in `nsTextFragment` due to insufficient OOM handling. This vulnerability affects Firefox ESR < 115.6, Thunderbird < 115.6, and Firefox < 121.

Related CVEs

Other vulnerabilities affecting the same vendor(s)

CVE-2026-16412 CRITICAL CVE-2026-16411 CRITICAL CVE-2026-16410 CRITICAL CVE-2026-16409 HIGH CVE-2026-16408 CRITICAL CVE-2026-16407 CRITICAL